Aluminum-Framed Fat Tire Electric Off-Road Bike
HKM-053907 Electric Off-Road Bike
The HKM-053907 is built for riders who want to get a long way from pavement and back again. A 2000 W peak geared hub motor produces roughly 80 N.m (59 lb-ft) of torque and a governed 37 mph (60 km/h) top speed; a removable 48 V 20 Ah pack of 21700 cells carries 960 Wh, good for 50 mi (80 km) on pedal assist. The frame is TIG-welded 6061 aluminum with internal cable routing, a forged bottom bracket junction, and reinforced dropouts sized for the motor torque. Kevlar-reinforced 20 x 4.0 in tires, an 80 mm fork with preload and lockout, dual-piston hydraulic discs on 180 mm rotors, a 2000-lumen headlight, and IP65 sealing throughout complete a genuinely all-season machine.
2000 W Peak Geared Hub80 N.m Torque48 V 20 Ah / 960 Wh Pack37 mph Top Speed50 mi Pedal-Assist RangeKevlar-Reinforced Fat Tires6061 Aluminum TIG-WeldedIP65 Weatherproof
Motor
2000 W Peak
Brushless geared rear hub, 80 N.m
Battery
48 V 20 Ah
960 Wh removable, 21700 cells
Top Speed
37 mph
60 km/h, electronically governed
Range
30-50 mi
48-80 km, throttle to pedal assist
Tires
20 x 4.0 in
Kevlar-reinforced, 5-30 psi
Load Capacity
330 lb
150 kg rider plus gear
Overview
The chassis is where this bike separates itself from the crowd. It is TIG-welded 6061 aluminum alloy, with internal cable routing that keeps wiring and brake lines inside the tubes and away from branches, a forged bottom bracket junction, and reinforced dropouts sized specifically for the torque a 2000 W hub motor puts through them. The geometry borrows from modern trail bikes: a slack head angle for stability at speed and a relatively short wheelbase to keep the steering responsive.
The motor is a geared hub rather than a direct-drive unit. Internal reduction gearing multiplies torque, which is why a nominally similar wattage produces roughly 80 N.m (59 lb-ft) at the wheel - enough to climb loose gradients without the drivetrain punishment a mid-drive inflicts on chain and cassette. Sinusoidal wave modulation keeps it near-silent, a finned aluminum housing and current-limiting firmware manage heat, and the motor cuts out instantly on either brake lever.
Energy comes from a removable 48 V 20 Ah pack built with automotive-grade 21700 cells for 960 Wh. Real-world range depends heavily on how you ride: pure throttle returns around 30 mi (48 km), while assist levels 1-3 stretch that to 50 mi (80 km). The display calculates a remaining-range estimate from your actual power draw rather than a fixed table, so the number in front of you reflects the terrain you are on. An optional second pack swaps in within seconds.
Fat tires do the heavy lifting off pavement. The 20 x 4.0 in casings are Kevlar-belted against punctures and run from 5 to 30 psi, giving you flotation on sand and powder snow at the low end and efficient rolling on hardpack at the high end. Alternating centre lugs keep rolling resistance down while aggressive shoulder blocks bite in corners. Double-wall aluminum rims on 13-gauge stainless spokes resist the dents that rock strikes inflict on lighter wheels.
Key Features
2000 W Peak Geared Hub Motor, 80 N.m
Internal reduction gearing multiplies motor torque before it reaches the wheel, producing roughly 80 N.m (59 lb-ft) at peak. Because drive goes straight from the hub to the ground, the chain and cassette never see motor load - a meaningful durability advantage over a mid-drive on a bike used off-road. Throttle response is crisp and linear, which matters when metering power through a rock garden.
48 V 20 Ah Removable Pack with 21700 Cells (960 Wh)
Automotive-grade 21700 cells carry more energy per cell than the older 18650 format and tolerate the discharge current a 2000 W peak motor demands. A multi-layer BMS monitors cell balance, temperature, voltage, and short-circuit protection. The pack is lockable, charges on or off the bike, and refills from empty in roughly 6-8 hours on the supplied 3 A smart charger.
80 mm Hydraulic Fork with Preload and Lockout
The front fork delivers 80 mm (3.15 in) of travel to absorb roots, potholes, and small drop-offs. A preload adjuster lets you dial sag to your weight, and a lockout lever firms the fork for efficient climbing on smooth surfaces. The rear triangle is rigid, which saves weight and removes a pivot to maintain - the tire volume handles the rest.
Dual-Piston Hydraulic Discs, 180 mm Rotors
Stainless 180 mm rotors front and rear with dual-piston calipers give progressive, fade-resistant braking on long loaded descents. The levers have reach adjustment for different hand sizes and the system arrives pre-bled for a firm bite from the first ride. Sintered pads hold their friction coefficient in the wet where organic pads fade.
Five Assist Levels, Walk Mode, and 7 Speeds
Five pedal-assist levels run from Eco, where the motor lightly supplements your pedalling to maximise range, to Sport, where every stroke calls on the full output. A half-twist throttle overrides pedal input entirely. Walk assist creeps the bike at 4 mph (6 km/h) when you are pushing it up a hiking trail or onto a rack, and the 7-speed derailleur means a flat battery still leaves you a rideable fat bike.
20 x 4.0 in Kevlar-Reinforced Fat Tires
A Kevlar belt under the tread and a thick casing sidewall cut puncture risk substantially, which matters a long way from the trailhead. The contact patch is several times that of a standard mountain bike tire, reducing ground pressure enough to float over sand, powder snow, and mud. Run 5-10 psi for soft ground and 20-30 psi for pavement.
2000-Lumen LED Headlight and Brake Tail-Light
A 2000-lumen headlight with a focused beam pattern throws enough light to ride unlit trail at real speed rather than merely being seen. The integrated tail-light runs as a steady marker and brightens under braking, and fork and seatstay reflectors add side-on visibility. Everything runs from the main pack.
3.5 in Backlit LCD with USB-A Charging
The high-contrast 3.5 in display stays legible in direct sun and auto-dims at night. It shows speed, battery percentage, assist level, odometer, trip distance, live wattage, and a calculated range estimate. A USB-A port on the housing keeps a phone or GPS charged, which turns a long day into a genuinely self-sufficient one.
Full Specifications
Model
HKM-053907 | Electric Off-Road Bike
Frame Material
6061 aluminum alloy, TIG-welded, internal cable routing, reinforced dropouts
Motor
2000 W peak brushless geared hub motor, rear mounted
System Voltage
48 V DC, sinusoidal wave modulation controller
Battery
48 V 20 Ah lithium-ion (960 Wh), 21700 cells, removable and lockable
Charger
3 A smart charger, 100-240 V input
Charging Time
6-8 hours from empty
Battery Cycle Life
Approximately 800 charge cycles to 80 percent capacity
Top Speed
37 mph (60 km/h), electronically governed, throttle only
Range Per Charge
Up to 50 mi (80 km) on pedal assist; approximately 30 mi (48 km) throttle only
Climbing Grade
Steep loose gradients within the 80 N.m torque rating with a solo rider
Peak Torque
Approximately 80 N.m (59 lb-ft)
Drivetrain
7-speed derailleur with trigger shifter
Brakes
Hydraulic disc, 180 mm rotors, dual-piston calipers, reach-adjustable levers
Suspension
Front hydraulic fork, 80 mm travel, preload and lockout; rigid rear triangle
Tires
20 x 4.0 in Kevlar-reinforced fat tires, 5-30 psi
Wheels
Double-wall aluminum rims on 13-gauge stainless steel spokes
Contact Points
Wide padded saddle, lock-on ergonomic grips, pinned platform pedals
Display
3.5 in backlit LCD: speed, battery, assist, odometer, trip, wattage, range estimate, USB-A port
Throttle
Half-twist grip throttle, variable power delivery, 5 assist levels plus walk mode
Lighting
2000-lumen LED headlight, brake-activated tail-light, fork and seatstay reflectors
Load Capacity
330 lb (150 kg) rider plus gear
Net Weight
79 lb (36 kg)
Dimensions and Fit
72.8 x 28.3 x 44.1 in (185 x 72 x 112 cm); riders 5 ft 4 in to 6 ft 4 in
Certifications
CE, RoHS; IP65 motor and battery; cells UN38.3 tested
Battery, Range, and Charging
The removable 48 V 20 Ah pack stores 960 Wh using automotive-grade 21700 cells. That cell format matters for a bike like this: it packs more energy per cell than the older 18650 standard and handles the sustained high discharge current a 2000 W peak motor draws on a long climb without excessive heating. A multi-layer BMS watches cell balance, temperature, voltage, and short-circuit conditions continuously.
Range splits clearly by riding style. Pure throttle riding returns around 30 mi (48 km). Assist levels 1-3 with genuine pedal input stretch that to 50 mi (80 km). Rather than quoting a fixed number, the display calculates a live range estimate from your actual power draw, so it adapts as the terrain changes. Cold weather, headwinds, soft tires, and heavy cargo all reduce the figure.
Tip: The pack is lockable and can be charged on or off the bike. A 3 A smart charger refills it from empty in approximately 6-8 hours. An optional second pack swaps in within seconds, which effectively doubles your exploring radius without waiting for a charge.
For storage longer than a month, leave the pack near 50 percent charge rather than full or empty and top it up every 4-6 weeks. Charging indoors at room temperature rather than in an unheated garage makes a measurable difference to how much capacity the pack retains after a few hundred cycles.
Daily Use & Care
- Match tire pressure to the surface: 5-10 psi for sand and snow, 10-15 psi for loose trail, 20-30 psi for pavement and hardpack.
- Rinse mud, sand, and salt off the frame, rims, rotors, and drivetrain after every dirty ride, then dry the bike before storing it.
- Wipe the fork stanchions clean after off-road rides so grit is not dragged past the seals on the next compression.
- Clean and re-lubricate the chain every 100-150 mi, and immediately after riding through water, sand, or deep dust.
- Re-torque the rear axle nuts weekly. The 80 N.m of hub torque works axle hardware loose faster than a conventional drivetrain.
- Check spoke tension by squeezing pairs of spokes every few rides; a loose spoke on a fat-tire wheel leads quickly to an out-of-true rim.
- Inspect hydraulic pad thickness monthly and replace before the friction material drops below 1 mm.
What's in the Box
- 1 x HKM-053907 electric off-road bike, approximately 85 percent pre-assembled
- 1 x 48 V 20 Ah removable lithium battery pack
- 1 x 3 A smart charger with 100-240 V input
- 2 x Battery keys
- 1 x Assembly toolkit with hex wrenches and pedal spanner
- 1 x Pair of pinned platform pedals
- 1 x Set of fork and seatstay reflectors
- 1 x User manual and assembly guide
Frequently Asked Questions
How fast can it really go?+
The controller governs the bike to 37 mph (60 km/h) in throttle-only mode. Actual speed varies with rider weight, terrain, tire pressure, and wind. Always comply with local e-bike regulations and wear safety gear appropriate to the speed you are riding.
Is the battery removable for charging?+
Yes. The 48 V 20 Ah pack unlocks and lifts out of the frame, so you can charge it indoors or swap in a spare. The supplied 3 A smart charger typically refills it in 6-8 hours. It can also be charged in place through the frame-side port.
Can I ride it in rain or snow?+
Yes. The motor, battery, and connectors carry an IP65 rating, which covers dust and low-pressure water jets. Dry the bike after exposure and avoid submersion in deep water. Do not aim a pressure washer at seals or connectors.
What terrain do the fat tires actually handle?+
Sand, mud, snow, gravel, and loose dirt. At 5-10 psi they float over soft surfaces where a narrow tire would dig in and stop; at 20-30 psi they roll efficiently on pavement and hardpack. The Kevlar belt under the tread reduces puncture risk from thorns and sharp rock.
Why a geared hub motor instead of a mid-drive?+
A geared hub uses internal reduction to multiply torque at the wheel, so you get roughly 80 N.m without putting any motor load through the chain and cassette. On a bike ridden off-road, where drivetrain wear is already accelerated by grit, keeping motor torque out of the chain is a real durability advantage.
What does walk assist do?+
Holding the walk-assist button drives the bike forward at 4 mph (6 km/h) while you walk beside it. At 79 lb the bike is heavy to push up a steep hiking section or onto a vehicle rack, and walk assist takes almost all of that effort away.
How much assembly is required?+
The bike ships approximately 85 percent assembled. Remaining work is the front wheel, handlebars, pedals, and reflectors, plus a brake and gear check. Most riders finish in under 30 minutes with the included tools. Have a shop verify brake bedding if you are not confident doing it yourself.
Does it require a license or registration?+
Regulations vary by jurisdiction. In some areas this bike can be operated under a Class 3 e-bike framework, but the 2000 W peak output and 37 mph top speed may classify it as a moped or electric motorcycle elsewhere. Check your local laws before riding on public roads or trails.
Service & Policies
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Every order ships free. Handling Time: 0-1 business days (Monday to Friday). Transit Time: 2-5 business days (Monday to Friday). A tracking number is emailed as soon as the parcel leaves our warehouse.
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24 Months Warranty Service
The product is covered by a 24-month warranty from the delivery date against manufacturing defects. Coverage includes parts and labor; normal-wear items are excluded.
CERoHSUN38.3 BatteryIP65 Rated960 Wh Pack6061 Aluminum Frame2000-Lumen Headlight
Why Choose the HKM-053907
Self-Sufficient for Long Days
A 960 Wh pack, a live range estimate calculated from real power draw, a 2000-lumen headlight, and a USB-A port for your phone or GPS add up to a bike you can take a long way from a trailhead without a support plan. That is a different proposition from a bike that merely goes off-road.
Aluminum Frame Built for Hub Torque
TIG-welded 6061 aluminum with a forged bottom bracket junction and reinforced dropouts is a chassis specified around the loads a 2000 W hub motor generates. Slack head angle for stability at speed, short wheelbase for responsive steering, and internal routing to keep cables out of harm.
Torque Without Drivetrain Wear
Internal reduction gearing gives roughly 80 N.m at the wheel while the chain and cassette carry only what your legs put through them. On a bike that spends its life in sand, grit, and mud, keeping motor torque out of the drivetrain saves a great deal of maintenance.
Near-Silent Sine-Wave Drive
Sinusoidal wave modulation replaces the coarse square-wave switching of cheaper controllers, so the motor emits a low hum rather than a high-pitched whine. On trail that means you hear the terrain and other users instead of your own bike.
Kevlar Belts Where Punctures Happen
A puncture ten miles into a sand wash is a long walk. The Kevlar belt under the tread and the thick casing sidewalls are the kind of specification that only matters once, but matters a great deal when it does.
IP65 Across Motor and Battery
Dust-tight and rated against low-pressure water jets, the electrical system treats rain, mud, and snow as normal operating conditions. Combined with the corrosion resistance of an aluminum frame, this is a bike that does not need to be put away for the winter.
Controls & Indicators
Power Button
Switches the system on and off and wakes the 3.5 in LCD
Handlebar Switch
Compact pad changing assist level and settings without releasing the grips
Half-Twist Throttle
Right-hand grip; variable power delivery independent of the assist level
Speedometer
Live speed on the backlit LCD, switchable between mph and km/h
Battery Gauge
Battery percentage plus a live range estimate calculated from actual power draw
Light Switch
Toggles the 2000-lumen headlight and the brake-activated tail-light
Walk Assist
Hold to drive the bike forward at 4 mph (6 km/h) while pushing it alongside you
Pre-Ride Safety Checklist
- Set tire pressure for the day: 5-10 psi for sand or snow, 10-15 psi for loose trail, 20-30 psi for pavement.
- Squeeze both brake levers. They should firm up well before the grip with no sponginess indicating air in the hydraulic line.
- Confirm the battery is locked into the frame and that the LCD shows the state of charge and range estimate you expect.
- Set fork preload for your weight and decide whether the lockout should be open or closed for the terrain ahead.
- Spin both wheels, check they run true, and squeeze pairs of spokes to confirm tension has not dropped.
- Check the rear axle nuts for torque, especially after any hard off-road ride.
- Confirm the 7-speed drivetrain shifts cleanly through the range before you commit to a climb.
- Switch on the headlight for low-light riding and wear a helmet rated for the 37 mph this bike is capable of.
Quick Troubleshooting
The motor does not respond to the throttle.+
Check that the LCD is on and showing charge, that the battery is locked into the frame, and that both brake levers are fully released, since the cut-off sensors disable drive while a lever is pulled. Note any error code shown before contacting support.
The motor loses power on a long climb.+
Current-limiting firmware reduces output as the motor approaches its thermal limit, which is protection rather than a fault. Ease off, add pedal input, and let the finned housing shed heat. If derating happens on moderate climbs, report it to support.
Range is much shorter than the quoted figure.+
Tire pressure is the usual culprit - a soft fat tire on pavement costs a surprising amount. Riding on pure throttle rather than assist roughly halves range by design. Cold weather also reduces capacity temporarily. A year-round drop of more than 30 percent suggests an ageing pack.
The brakes feel spongy at the lever.+
Sponginess in a hydraulic system indicates air in the line or a fluid leak. Stop riding and have the system bled and inspected. Do not start a descent on a 37 mph bike with compromised brakes.
The rear wheel has gone out of true after a rocky ride.+
Check spoke tension first, since 80 N.m of hub torque loads spokes far harder than a chain drive does. Squeeze pairs of spokes to find loose ones. A wheel that is more than slightly out of true should be retensioned and trued by a shop rather than ridden.
The LCD shows an error code and the bike will not move.+
Power the system off, wait 30 seconds, and restart. If the code returns, record the exact code and the conditions that produced it, then contact support - codes map to specific faults in the controller, motor, throttle, or battery circuits.
Certifications & Standards
The HKM-053907 is produced in a facility operating under an ISO 9001 quality management system. The battery cells and the assembled pack carry the test documentation normally required for lithium-ion transport and sale, and the motor, battery, and connectors are rated IP65 against dust and low-pressure water jets.
- CE - European Conformity marking covering the electrical assembly.
- RoHS - Restriction of Hazardous Substances compliance for the electronics.
- UN38.3 - Battery transport safety testing, required for lithium-ion shipping by air, sea, and road.
- IP65 - Dust-tight and protected against low-pressure water jets, covering motor, battery, and connectors.
- ISO 9001 - Quality management system certification held by the manufacturing facility.
Important Safety Notes
This bike is governed to 37 mph (60 km/h) and produces around 80 N.m of torque from a standstill. Read the manual fully before the first ride and practise throttle control in an open, traffic-free area. Off-road, walk unfamiliar sections before riding them at speed - fat tires float over a great deal, but they do not tell you what is underneath.
- Wear a helmet on every ride. At 37 mph a bicycle helmet is the minimum; a full-face helmet with goggles is appropriate for technical off-road riding.
- Do not exceed the 330 lb (150 kg) load capacity, which includes the rider and all carried gear.
- Check local law before riding on public roads or trails. A 2000 W peak motor and 37 mph top speed may place this vehicle outside standard e-bike classifications in your area.
- Bed the brake pads in with 10-15 progressive stops during the first few rides before riding at full pace or attempting a long descent.
- Check spoke tension and axle torque regularly. High hub torque loads the rear wheel far more than a conventional drivetrain does.
- IP65 covers rain, mud, and snow, not submersion. Do not ride through water deep enough to reach the hub motor or the battery compartment.
- Charge only with the supplied 3 A charger, indoors, at room temperature, on a non-flammable surface, and do not leave a charging pack unattended overnight.
- Do not open, puncture, or modify the battery pack. Damaged lithium cells can vent and ignite.
HKM-053907 · 2000 W peak brushless geared rear hub motor, approximately 80 N.m (59 lb-ft) · 48 V 20 Ah removable lithium (960 Wh, 21700 cells) · 37 mph (60 km/h) governed top speed · up to 50 mi (80 km) pedal assist, approximately 30 mi (48 km) throttle · 20 x 4.0 in Kevlar-reinforced fat tires, 5-30 psi · 80 mm hydraulic fork with preload and lockout · dual-piston hydraulic disc brakes, 180 mm rotors · 6061 aluminum TIG-welded frame · 3.5 in backlit LCD with USB-A · 2000-lumen LED headlight · IP65 · 330 lb (150 kg) load capacity · 79 lb (36 kg) net weight. Specifications are provided for reference; actual performance varies with rider weight, terrain, tire pressure, temperature, and riding style. Range figures are measured under moderate pedal-assist on level ground. This page describes the product only and is not legal advice regarding vehicle classification - confirm local regulations before riding on public roads or trails.
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